Most operations that take place on Divio projects can be considered routine operations, and will not under normal circumstances interrupt the function of web applications.
Some however by their nature are more complex and can require a brief downtime. The most notable example is deployments that require a change of deployment region, such as cloudshift operations (below). These are regarded as Maintenance operations.
Maintenance operations will only take place during designated weekly maintenance windows, to control when downtime occurs.
By default, a site’s maintenance window is set to hours UTC 01:00-05:00 each Monday, but this can be changed to suit your business needs. A queued maintenance action can also be triggered manually using the Start now option to run immediately, outside the window.
A cloudshift operation moves an application from one region to another. As well as entailing a short downtime, it may also require amending external services such as DNS that need to identify the application.
In the case of DNS changes, we advise reducing DNS TTLs well in advance of the migration, so that when DNS entries are changed, disruption is minimised.